If you have good tires on 5 lug wheels, sell the wheels and buy 6 lug wheels. Unless you are very lucky, you'll spend a lot of time searching for a 5-lug rear axle, and it will very likely need to be re-geared to your current ratio. And parts for the front axle won't be free.
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk